18: A case reportF-FDG PET/CT imaging of atypical subacute thyroiditis in thyrotoxicosis: A case report

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Abstract

Background:

In addition to its established role in oncologic imaging, 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) is useful for the assessment of inflammatory activity. However, subacute thyroiditis (SAT) in thyrotoxicosis is rarely detected during these scans.

Case:

A 66-year-old man with SAT in thyrotoxicosis demonstrated symptoms of transient fatigue, headache, and fever, without typical neck pain. Using 18F-FDG PET/CT, we found increased 18F-FDG uptake in the thyroid gland, predominantly in the right side due to SAT. We also observed a coexisting decrease in 18F-FDG uptake in the liver and increased 18F-FDG uptake in skeletal muscle due to thyrotoxicosis.

Conclusion:

Using 18F-FDG PET/CT, the combined observations of increased 18F-FDG uptake in the thyroid and skeletal muscle, and decreased 18F-FDG uptake in the liver, even when the typical symptom of neck pain is subtle or absent, may be helpful for the differential diagnosis of SAT in thyrotoxicosis.

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